President Clinton and his national security team ignored several opportunities to capture Osama bin Laden and his terrorist associates, including one as late as last year.

I know because I negotiated more than one of the opportunities.

From 1996 to 1998, I opened unofficial channels between Sudan and the Clinton administration. I met with officials in both countries, including Clinton, U.S. National Security Advisor Samuel R. "Sandy" Berger and Sudan's president and intelligence chief. President Omar Hassan Ahmed Bashir, who wanted terrorism sanctions against Sudan lifted, offered the arrest and extradition of Bin Laden and detailed intelligence data about the global networks constructed by Egypt's Islamic Jihad, Iran's Hezbollah and the Palestinian Hamas.

Among those in the networks were the two hijackers who piloted commercial airliners into the World Trade Center.

The silence of the Clinton administration in responding to these offers was deafening.

As an American Muslim and a political supporter of Clinton, I feel now, as I argued with Clinton and Berger then, that their counter-terrorism policies fueled the rise of Bin Laden from an ordinary man to a Hydra-like monster.

Realizing the growing problem with Bin Laden, Bashir sent key intelligence officials to the U.S. in February 1996.

The Sudanese offered to arrest Bin Laden and extradite him to Saudi Arabia or, barring that, to "baby-sit" him--monitoring all his activities and associates.

But Saudi officials didn't want their home-grown terrorist back where he might plot to overthrow them.

In May 1996, the Sudanese capitulated to U.S. pressure and asked Bin Laden to leave, despite their feeling that he could be monitored better in Sudan than elsewhere.

Bin Laden left for Afghanistan, taking with him Ayman Zawahiri, considered by the U.S. to be the chief planner of the Sept. 11 attacks; Mamdouh Mahmud Salim, who traveled frequently to Germany to obtain electronic equipment for Al Qaeda; Wadih El-Hage, Bin Laden's personal secretary and roving emissary, now serving a life sentence in the U.S. for his role in the 1998 U.S. embassy bombings in Tanzania and Kenya; and Fazul Abdullah Mohammed and Saif Adel, also accused of carrying out the embassy attacks.

Some of these men are now among the FBI's 22 most-wanted terrorists.

The two men who allegedly piloted the planes into the twin towers, Mohamed Atta and Marwan Al-Shehhi, prayed in the same Hamburg mosque as did Salim and Mamoun Darkazanli, a Syrian trader who managed Salim's bank accounts and whose assets are frozen.

Important data on each had been compiled by the Sudanese.

But U.S. authorities repeatedly turned the data away, first in February 1996; then again that August, when at my suggestion Sudan's religious ideologue, Hassan Turabi, wrote directly to Clinton; then again in April 1997, when I persuaded Bashir to invite the FBI to come to Sudan and view the data; and finally in February 1998, when Sudan's intelligence chief, Gutbi al-Mahdi, wrote directly to the FBI.

Gutbi had shown me some of Sudan's data during a three-hour meeting in Khartoum in October 1996. When I returned to Washington, I told Berger and his specialist for East Africa, Susan Rice, about the data available. They said they'd get back to me. They never did. Neither did they respond when Bashir made the offer directly. I believe they never had any intention to engage Muslim countries--ally or not. Radical Islam, for the administration, was a convenient national security threat.

And that was not the end of it. In July 2000--three months before the deadly attack on the destroyer Cole in Yemen--I brought the White House another plausible offer to deal with Bin Laden, by then known to be involved in the embassy bombings. A senior counter-terrorism official from one of the United States' closest Arab allies--an ally whose name I am not free to divulge--approached me with the proposal after telling me he was fed up with the antics and arrogance of U.S. counter-terrorism officials.

The offer, which would have brought Bin Laden to the Arab country as the first step of an extradition process that would eventually deliver him to the U.S., required only that Clinton make a state visit there to personally request Bin Laden's extradition. But senior Clinton officials sabotaged the offer, letting it get caught up in internal politics within the ruling family--Clintonian diplomacy at its best.

Clinton's failure to grasp the opportunity to unravel increasingly organized extremists, coupled with Berger's assessments of their potential to directly threaten the U.S., represents one of the most serious foreign policy failures in American history.

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Mansoor Ijaz, a member of the Council on Foreign Relations, is chairman of a New York-based investment company.